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In order to solve the engineering construction problem of lightning protection in permafrost regions along the Qinghai-Tibet railway, based on the soil characteristics in plateau permafrost regions, Zhongguang Hi-Tech Industrial Development Group set up an earthing test base in Balang mountain, the permafrost condition of which is very similar to that of Qinghai-Tibet railway. Field tests of reducing...
Plasma is used as a shielding material in special applications where instantaneous tuneable shielding is required. Most of the analysis in the past treats non-magnetic plasma as a uniform medium with complex permittivity, which is not true due to the sustaining current that is needed to keep the plasma alive. The externally applied electric field causes anisotropic permittivity of plasma, and thus...
A simulation model based on finite-element method is presented to analyze the soil ionization phenomenon around the grounding system under the impulse current. In this method, The non-linear characteristic of soil under an accidental short circuit or a stroke of lightning is taken into account by setting the resistivity of soil element varying with the electric field intensity of every element; open...
Based on the screen-printing technology, conductive meshed patterns are printed on a flexible substrate with different loadings. Using empirical formulae, the shielding effectiveness (SE) for the different printed meshed screens is first determined and later verified through experiment. Both the calculated and experimental results demonstrate that reasonably good SE for this type of printed meshed...
We have calculated lightning-induced voltages on a 680-m long overhead two-wire line using the finite-difference time-domain (FDTD) method for solving Maxwell's equations. The FDTD method employed here uses a three-dimensional nonuniform grid, which is fine (cell side length is 0.875 m) in the vicinity of overhead wires and coarse (maximum cell side length is 7 m) in the rest of the space. The overhead...
The demands of environmentally friendly and whisker-generation-resistant board level shields are increasing with endless marking requirements for high EMC performance and cost-effective electronic products. As a result, some environmentally friendly composite plating steels, such as chromate-free electrogalvernized steel (ZE-38) and ECO-TRIO steel, have been developed and emerged as promising board...
This work presents an analysis of the overvoltage in the secondary network caused by lightning discharges that are transferred from the primary through the transformer. Numerical simulations using TLM- Transmission Line Modeling and ATP- Alternative Transients Program are presented to show and to establish comparisons between two models for the grounding resistance of the transformer and customer:...
Comparative analysis was made between the ground potential rise resulted from an artificially-triggered flash, the channel base current and close magnetic fields. The results indicated that the current peaks of the two strokes in artificially-triggered flash were 41.6 and 29.6 kA. The inferred currents, based on the close magnetic fields, were about 39.8 and 29.1 kA, in agreement with the measured...
This paper deals with modeling and simulation of cable bundles for automotive EMC tests. A new stochastic cable bundle model is presented. The parameters of the model are grouped into parameters for geometry, simulation, and disorder. Using a particularly developed cable bundle testbench, the model is validated against measurements and the parameter dependencies are investigated. The parameter study...
In this talk, we will introduce a novel methodology using existing electromagnetic modelling tools for interconnect and packaging structures to simulate and model the temperature distribution without major modifications to these tools or simulated structures. This methodology can easily be integrated with the chip technology information and frame an electrical circuit simulator into an automatic,...
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